Contrafibbularities shows how easy it is to create holes in hard surface models using the NitroCycle plugin.
Nitro4D is one of the hardest working Cinema 4D Tools developers. The range of tools is extensive and super helpful with a lot of workflows. When it comes to modeling, a small but beneficial tool is NitroCycle. Check out this tutorial from Contrafibbularities (Wolfgang Rode), who shows how to create holes in objects using the plugin.
Nitrocycle is a one-click tool that allows you to circularize components from any selection. From that point, it’s easy to convert that circle into a well-topologized hole. The plugin for Cinema 4D is around $17.00 and is a huge time-saver.